Core for hollow castings.



J. K. DIMMIGK.

CORE FOR HOLLOW GASTINGS. v APPLICATION FILED AUG. 28, 1908.

Patented May 25, 1909.

2 SHEETS-SHEET 1.

UVVEN TOR J. K. DIMMIGK. GORE FOR HOLLOW (HASTINGS.

APPLICATION FILED AUG. 28, 1908. 922 7 Patented May 25, 1909 2 SHEETS-SHEET 2.

INVENTOR WITNESSES W v ATTORNEY UNITED %TATE% PATENT JACOB K. DIMMICK, OF PHILADELPHIA, PENNSYLVANIA.

CORE FOR HOLLDW CASTINGS.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed August 28, 1908. Serial No. 450,641.

Vania, have invented certain new and useful Improvements in Cores for Hollow Castings, of which the following is a full, clear, and exact disclosure, reference being had to the ac- 1 companying drawings, forming a part of this specification.

to provide a core for use in casting hollow erence figures, Figure 1 is a vertical, longitudinal, sectional view of a flask in which is mounted my improved core with the parts thereof shown partly in section; Fig. 2 is a perspective of a modification of the core-bar used in my improved core; Fig. 3 is a reduced entire top plan view of Fig. 1 and Fig. l is a reduced. sectional view taken on the line 4-4 of Fig. 1.

In Fig. 1, a suitable flask is indicated by 1,

The principal Objects of my invention are having a base 2 to which the main body of the ilask is fastened by any suitable means,

metal bodies, such as pipe, in which suitable I passages arei provided for permitting the emission of gases, steam, etc. formed during 1 5' position by removable clamps 6-6.

the casting operation, without materiallyf lessening the strength of the core-bar, and to provide a core which will not permit the molten metal to enter tho-interior of the core-bar.

Other objects of my invention will appear from the following description and the. accompanying drawings.

It is well known to those skilled in the art that in casting operations in which a core is used it is necessary to provide passages thcrc in leading to the outside atmosphere, to .allow theescape of the gases, steam, etc. generated when the molten metal is poured, for if such passages are'not provided, explosions may occur, and unsatisfactory castings may be obtained. In cores heretofore constructed, such passages have been provided only by materially lessening the strength of the core-bar, so that when unusual pressure is applied thereto, such as being dropped,

A top plate 5 is held in 7 indicates the core, which consists of the core-bar 8, about which is wound a covering, which usually consists of a layer of hay rope 9, upon such as the bolts 3.

' which is placed a layer of mud, shown at 10,

which layer, in turn, is covered by a second layer of mud, shown at 1].. Any suitable covering may be employed which will leave the ilutes upon the core-bar free to allow the passage of the gases, steam, etc. The 1nolding pattern of, sand, which forms the exterior surface of the casting, is shown at 12.

The core-bar which I have shown in Fig. l, and a modification of which is shown in Fig. 2, consists of a hollow, cylindrical body, preferably made of iron, upon the cylindrical surface of which are provided flutes 1313 of suitable depth, to allow of the passage 01' the gases, etc. -While I have shown these l'lutes as substantially semi-circular grooves, of substantially cvcn depth, and running in parallel straight lines lengthwise of the core,

bar, I do not limit myself to such a constructhe bar is very likely to be damaged and its 5 lurther uiihtf. unpaired; and furthermore, j

the molten metal may work through the outer -ovcrmg of the core, and then pass into the interior of the core-bar throughthc i passages, thereby usualfv destroying" the core-bar, and oftentimes the listing. in my improved core, .1 have entirely removed these objections, and have provided a core in which are suitable passages for the emission of the gases, etc, while the strength of the core-bar is not materially lessened, and in which the influx of the moltcnmetal within the interior of the core-bar is prevented.

1n the accompanying drawings, in which similar parts are referred to by similar ref 1 in the scope of my invention.

tion, for it is obvious that the flutes may be channcl-slraped or triangular in cross section, or of many other forms which will come with- ].t is also obvious that the flutes do not necessarily run in straight lines along the. cylindrical surfacj of the/bar, nor that they are parallel, for they may run spirally about the core-bar and in non-parallel lines. It is only necessary that the. ilutes should be of suflicient depth that the fillets 14--14 be of suiiicient height and frequency to support the inner layer of the covering, such as is shown at 9, to prevent the. same from filling or obstructing the i'lutc-s 1313.

I have shown the core-bar as being of the,

hollow cylindrical type, but it is apparent that it is not necessary that it should be holsurface of the core-bar.

low, -for it maybe solid if desired, and equally well permit the free passage to the air,

through the flutes, of the gases, steam, etc., and it is also apparent that the core-bar may be of any desired shape or form suitable to or as required by the core. Means are provided for permitting the easy removal of the upper end of the CO16*-l02.1,it3 shown in Fig.

core-bar by the eye-bolt 15, to which suitable hoistin a )Et'littliS Ina beattac-hed which is mounted. upon a spider webbing 1 6 in the A similar spider webbing-17, which also serves to strengthen theeore-bar', is provided in the lower end of the core-bar, as shown in Fig. 1. In the top plate 5 is any'suitable gate 18, throu h'whiclr the molten metal is poured when t e casting operation is being proceeded with.

In the base 2 which is seated the core 7, and which. also serves to accuratelycenter the core and main-- tain itin such position. 1 i

The operation of my invention may he briefly described as follows: When the core 7 is placed in position, as shown in'Fig. 1, the mold pattern 12 having been prepared, the molten metal is poured into the flask, through the gate 18,and fills the space 20, between the outer surface of the core and the inner surfaoeof the mold pattern, which determine the shape, thickness, etc. of the desired casting. While the molten metal .is'cooling,

gases and steam, vapors, etc. are generated in the sand within the flask and in the covering of the corebar,for which passages to the outer atmosphere must be provided. The covering of' the core-bar, being porous, per mits the said gases, steam, vapors, etc. to pass therethrough and enter the vents 13- 13, which conduct the same into the atmosphere without the llask. It will therefore be apparent that I have provided. an improved core, whereby casting operations may be carried on at a very small expense,'inasmuch as l have provided against the breaking of the core-bar and also against its destruction by the influx of the molten metal within its interior,'and l have also provided a core-bar which may be used for an indefinite number of times.

v Having thus described my invention, what ll claim and desire to protect by Letters Patout of the United States is: V

1. ll. core, comprising a flute-vented corebar and a coating therefor.

I 2'. A core, comprising a core-bar, a coating therefor, and flute vents upon the core-bar inclosed by said coating.

3. In a core for hollow castin s, a core-bar having a groove vent upon the body portion thereof. n

i. Acore, comprising a eore-bar, a coating lor the body portion oi said COl'l-Frlliii, and

is provided a, socket 19, in.

terior surface of the body olurality ol' fluted vents upon the covered 5/111 a core, a core-bar having a flute vented surface.

6. A core, comprisingscore-bar having a 10. A core, comprising-a core-bar, a coatmg for said core-bar, and fluted vents 1n said core-bar inclosed by said coating.

11. In a core for hollow castings, a cylindrically shaped core-bar having a groove upon the exterior surface of the body portion thereof. 12. In a core for hollow castings, a cylindrically shaped core-bar having a groove upon the exterior surface of the body portion thereof andterminating at the ends thereof.

13. A core, comprising a cylindrically shaped core-bar having flutes upon the exand a coating inclosing sa l body portion, and flutes thereon. g g

1.4. A. core for hollow castings, comprising a core-bar having vents running lengthwise ortion. thereof,

thereof, and a coating substantially inclosing the core-bar but leaving the fluted ends free.

' 15. In a core for hollow castings, a hollow core-bar, a plurality of flutes running lengthwise upon the exterior surface of said core- .bar, and webbings within each end of the 1 core-bur.

16. In a core ior hollow castings, a hollow core-bar, a plurality of flutes running lengtlu wise upon the exterior surface of said corehar,.webbings within each end of the corebar, and an eye-bolt mounted upon one of said wehbings and extending beyond the ad' jaccnt end 01' the corebar.

17. The combination with a core for hol low castings having a fluted cor-char, of a flask. having an opening therein adapted to engage an end of the core-bar and thereby maintain the core in a substantially stationary position. j 18. The combination with a core for hollow castirligs having a fluted core-bar, one end of which tern'iinatesin'a reduced portion of a ilaslt having an opening'therein adapted to engage said reduced end portion ol said corebar and thereby maintain the core in a substantiallystationary position. W 1

19. A core, comprising a fluted core-bar and a coating therefor, said coating consist ing' of an inner layer of hay rope, an interllO lill) mediate layer of mud and an outer layer of i mud.

20. A core, comprising a fluted core-bar and a coating therefor, said coating consist- 5 ing of a layer of hay rope and superimposed layers of mud. In Witness whereof, I have hereunto set my hand this 27th day Of Aogust, A. 1)., 1908. JACOB 1i. DIMMIOK.

Witnesses:

LILLIAN A. CLOUGI-ILEY, ALEXANDER PARK. 

